diff --git a/common/static/common/js/discussion/utils.js b/common/static/common/js/discussion/utils.js
index b55b87fa3e..20ee03cb90 100644
--- a/common/static/common/js/discussion/utils.js
+++ b/common/static/common/js/discussion/utils.js
@@ -485,7 +485,7 @@
         };
 
         DiscussionUtil.typesetMathJax = function(element) {
-            if (typeof MathJax !== 'undefined' && MathJax !== null) {
+            if (typeof MathJax !== 'undefined' && MathJax !== null && MathJax.Hub !== 'undefined') {
                 MathJax.Hub.Queue(['Typeset', MathJax.Hub, element[0]]);
             }
         };